Battery monomer, battery and electric equipment

Abstract

The utility model provides a single battery, a battery and electric equipment, the single battery comprises an electrode assembly, a shell and an end cover, the peripheral side wall of the shell is bent to form a bent part, the shell is provided with a turnup part at an opening, the bent part and the turnup part jointly enclose to form a connecting groove, the end cover covers the opening and is at least partially inserted into the connecting groove, and the end cover is arranged in the connecting groove. An insulating part is arranged in the connecting groove, and a first insulating layer body is arranged on the inner wall surface of the connecting groove; according to the battery monomer provided by the embodiment of the invention, the first insulating layer body is arranged on the groove inner wall surface of the connecting groove, so that the probability of short circuit between the end cover and the groove inner wall surface of the connecting groove can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery structure, and in particular provides a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] In some types of battery cells, for example, battery cells with a groove structure, a bending portion is formed on the shell that is bent inward, and the electrode assembly in the shell is limited by the bending portion; due to the structural particularity of this type of battery cell itself, insulation failure is likely to occur between the top cover sheet and the area near the bending portion, resulting in the battery cell being unable to be used normally. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the problem that the battery cell of the related art is prone to insulation failure in the area near the end cover and the bend portion.

[0005] The technical solution adopted in the embodiment of the present application is:

[0006] In the first aspect, an embodiment of the present application provides a battery cell, including an electrode assembly, a shell end cover, an insulating member and a first insulating layer body, a accommodating cavity with an opening is formed on the shell, the peripheral side walls of the shell are bent toward the accommodating cavity to form a bending portion, and the electrode assembly is limited and arranged in the accommodating cavity by the bending portion; the shell is provided with a flange portion at the opening, and the bending portion and the flange portion are together enclosed to form a connecting groove; the end cover is covered on the opening, and at least a portion of the end cover is inserted into the connecting groove; at least a portion of the insulating member is arranged in the connecting groove, and is located between the end cover and the inner wall of the connecting groove, and the first insulating layer body is arranged on the inner wall surface of the connecting groove.

[0007] Beneficial effects of the embodiments of the present application: In the battery cell provided in the embodiments of the present application, the end cover is inserted into the connecting groove to be assembled at the opening of the shell, and the end cover and the inner wall of the connecting groove are sealed and insulated by an insulating member; at the same time, a first insulating layer is arranged on the inner wall surface of the connecting groove formed by the bending portion and the flange portion, thereby effectively reducing the probability of short circuit between the end cover and the inner wall surface of the connecting groove, thereby reducing the probability of insulation failure between the end cover and the bending portion and the flange portion of the shell.

[0008] In some embodiments, a portion of the flange portion located outside the connecting groove is provided with a second insulating layer body, and the second insulating layer body is connected to the first insulating layer body.

[0009] By adopting the above-mentioned technical solution, a second insulating layer body is provided in the part of the flange portion located outside the connecting groove to provide insulation protection for the flange portion, thereby effectively reducing the probability of overlapping short circuit between the flange portion and the external structure; at the same time, the connection between the first insulating layer body and the second insulating layer body can make the insulation protection effect between the end cover and the flange portion better.

[0010] In some embodiments, the second insulating layer extends to cover at least a portion of the outer peripheral wall of the shell.

[0011] By adopting the above-mentioned technical solution, by extending the second insulating layer from the flange portion to covering at least a portion of the outer peripheral wall of the shell, the second insulating layer can provide more sufficient insulation protection for the outer surface of the shell, and can further reduce the probability of overlapping short circuits between the shell and the external structure.

[0012] In some embodiments, an insulating protective film is wrapped around the outer peripheral wall of the shell, and on any plane parallel to the height direction of the shell, the orthographic projection of the insulating protective film intersects with the orthographic projection of the second insulating layer.

[0013] By adopting the above-mentioned technical solution, the second insulating layer body and the insulating protective film wrapped around the outer wall of the shell are connected, so that the second insulating layer body and the insulating protective film are used to jointly prevent the outside of the shell from slipping, thereby further reducing the probability of overlapping short circuits between the shell and the external structure.

[0014] In some embodiments, the thickness of the first insulating layer is J, the thickness of the shell is D, wherein 0<J / D≤1; and / or the thickness of the second insulating layer is K, the thickness of the shell is D, wherein 0<K / D≤1.

[0015] By adopting the above-mentioned technical solution, by setting the ratio of the thickness of the first insulating layer body to the thickness of the shell to be greater than 0 and less than or equal to 1, that is, the thickness of the first insulating layer body is not greater than the thickness of the shell, the thickness range of the first insulating layer body is limited to reduce the influence of the thickness of the first insulating layer body on the space of the accommodating cavity inside the shell; and / or, by setting the ratio of the thickness of the second insulating layer body to the thickness of the shell to be greater than 0 and less than or equal to 1, that is, the thickness of the second insulating layer body is not greater than the thickness of the shell, the thickness range of the first insulating layer body is limited to reduce the influence of the second insulating layer body on the overall volume of the battery cell.

[0016] In some embodiments, 0.1≤J / D≤0.5; and / or, 0.1≤K / D≤0.5.

[0017] By adopting the above-mentioned technical scheme, by further limiting the ratio of the thickness of the first insulating layer body to the thickness of the shell to be greater than or equal to 0.1 and less than or equal to 0.5, the thickness of the first insulating layer body can be further reduced while ensuring the insulation of the first insulating layer body; and / or, by further limiting the ratio of the thickness of the second insulating layer body to the thickness of the shell to be greater than or equal to 0.1 and less than or equal to 0.5, the thickness of the second insulating layer body can be further reduced while ensuring the insulation of the second insulating layer body.

[0018] In some embodiments, the insulating member includes an insulating portion and a sealing portion, wherein at least a portion of the insulating portion is located between the end cap and the flange portion, and at least a portion of the sealing portion is located between the end cap and the bent portion.

[0019] By adopting the above technical solution, the insulating part is used to provide insulation protection between the end cover and the flange part, and the sealing part is used to provide sealing protection between the end cover and the bending part.

[0020] In some embodiments, a portion of the insulating portion extends into the opening and is used to separate the end cap and the flange portion.

[0021] By adopting the above-mentioned technical solution, by extending part of the insulating part into the opening, the extended part of the insulating part can separate the flange part from the end cover located at the opening, which can more fully provide insulation protection for the flange part, thereby further reducing the probability of short circuit between the end cover and the flange part.

[0022] In some embodiments, a portion of the bent portion located within the accommodating cavity is provided with a third insulating layer body, the third insulating layer body is used to separate the bent portion and the electrode assembly, and the third insulating layer body is connected to the first insulating layer body.

[0023] By adopting the above technical solution, a third insulating layer is provided at the portion of the bending portion located in the accommodating cavity, and the third insulating layer is used to separate the bending portion and the electrode assembly, so as to effectively reduce the probability of overlapping short circuit between the electrode assembly and the bending portion.

[0024] In some embodiments, the battery cell further includes a fourth insulating layer body, which is disposed on the outer surface of the electrode assembly facing the bending portion; in the height direction of the shell, the orthographic projection of the fourth insulating layer body intersects with the orthographic projection of the third insulating layer body.

[0025] By adopting the above-mentioned technical solution, the fourth insulating layer body is used to be arranged on the outer surface of the electrode assembly facing the bending portion to achieve insulation protection for the electrode assembly. At the same time, the orthographic projections of the fourth insulating layer body and the third insulating layer body in the height direction of the shell intersect, so that the fourth insulating layer body and the third insulating layer body can be used together for insulation protection between the bending portion and the electrode assembly, so as to further reduce the probability of overlapping short circuit between the electrode assembly and the bending portion.

[0026] In some embodiments, in the height direction of the shell, the fourth insulating layer body and the third insulating layer body have an overlapping width M, and the width of the bent portion is N, wherein 0≤M / N<1.

[0027] By adopting the above-mentioned technical scheme, by limiting the ratio between the overlapping width M of the fourth insulating layer body and the third insulating layer body in the height direction of the shell and the width N of the bending portion to be greater than or equal to 0 and less than 1, that is, the fourth insulating layer body and the third insulating layer body can only intersect but not overlap, or the fourth insulating layer body and the third insulating layer body can overlap, and the overlapping range of the fourth insulating layer body and the third insulating layer body is within the width range of the bending portion, so as to provide sufficient insulation protection between the bending portion and the electrode assembly.

[0028] In some embodiments, 0≤M / N≤0.5.

[0029] By adopting the above-mentioned technical scheme, by limiting the ratio of the overlapping width M of the fourth insulating layer body and the third insulating layer body in the height direction of the shell and the width N of the bending portion to be greater than or equal to 0 and less than or equal to 0.5, that is, further limiting the overlapping range of the fourth insulating layer body and the third insulating layer body to half or less of the width range of the bending portion, the amount of the fourth insulating layer body and / or the third insulating layer body can be reduced on the basis of providing sufficient insulation protection between the bending portion and the electrode assembly.

[0030] In some embodiments, a gap is formed between the third insulating layer and the inner peripheral wall of the shell.

[0031] By adopting the above-mentioned technical solution, the third insulating layer is set to form a gap with the inner circumferential wall of the shell so that the third insulating layer will not extend to the inner circumferential wall of the shell, thereby reducing the influence of the third insulating layer's own thickness on the space utilization of the electrode assembly in the radial direction.

[0032] In some embodiments, the thickness of the third insulating layer is L, and the thickness of the shell is D, wherein 0<L / D≤1.

[0033] By adopting the above-mentioned technical solution, by setting the ratio of the thickness of the third insulating layer body to the thickness of the shell to be greater than 0 and less than or equal to 1, that is, the thickness of the third insulating layer body is not greater than the thickness of the shell, the thickness range of the third insulating layer body is limited to reduce the influence of the thickness of the third insulating layer body on the space of the accommodating cavity inside the shell.

[0034] In some embodiments, 0.1≤L / D≤0.5.

[0035] By adopting the above-mentioned technical solution, the ratio of the thickness of the third insulating layer body to the thickness of the shell is further limited to be greater than or equal to 0.1 and less than or equal to 0.5, so as to limit the thickness range of the third insulating layer body to reduce the influence of the thickness of the third insulating layer body on the space of the accommodating cavity inside the shell.

[0036] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell as described above.

[0037] Beneficial effects of the embodiments of the present application: The battery provided by the embodiments of the present application includes the above-mentioned battery cells. When the probability of insulation failure of the above-mentioned battery cells is low, the probability of insulation failure of the battery is also low.

[0038] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery as described above, and the battery is used to provide electrical energy.

[0039] Beneficial effects of the embodiments of the present application: The electrical equipment provided by the embodiments of the present application includes the above-mentioned battery. When the probability of insulation failure of the above-mentioned battery is low, the probability of insulation failure of the electrical equipment is also low. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0042] Figure 2 An exploded view of a battery provided in an embodiment of the present application;

[0043] Figure 3 An exploded view of a battery cell provided in an embodiment of the present application;

[0044] Figure 4 A cross-sectional view of a battery cell provided in an embodiment of the present application;

[0045] Figure 5 It is a partial enlarged schematic diagram of point A when the battery cell only includes the first insulating layer;

[0046] Figure 6 It is a partial enlarged schematic diagram of point A when the battery cell includes a first insulating layer body and a second insulating layer body;

[0047] Figure 7 It is a partial enlarged schematic diagram of point A when the battery cell includes a first insulating layer body and a third insulating layer body;

[0048] Figure 8 It is a partial enlarged schematic diagram of point A when the battery cell includes a first insulating layer body, a second insulating layer body and a third insulating layer body.

[0049] Among them, the reference numerals in the figure are:

[0050] 1000. Vehicles;

[0051] 100, battery; 200, controller; 300, motor;

[0052] 10. Box body; 11. First part; 12. Second part;

[0053] 20. Battery cells;

[0054] 21, housing; 211, accommodating cavity; 212, opening; 213, bending portion; 214, flange portion; 215, connecting groove; 216, insulating protective film;

[0055] 22. end cap; 221. electrode terminal;

[0056] 23. electrode assembly; 231. pole ear;

[0057] 24. a first insulating layer; 25. a second insulating layer; 26. a third insulating layer; 27. a fourth insulating layer;

[0058] 28. Insulating member; 281. Insulating portion; 282. Sealing portion;

[0059] H. Height direction. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of the present application, the terms "length", "width", "thickness", "inside", "outside", "up", "down", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0063] The terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, the first guide and the second guide are only used to distinguish different guides, and their order is not limited. The first guide can also be named as the second guide, and the second guide can also be named as the first guide without departing from the scope of the various described embodiments. And the terms "first", "second", etc. do not limit the indicated features to be different.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The meaning of "plurality" is at least two, that is, two or more.

[0065] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0067] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0068] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0069] In some types of battery cells, for example, battery cells with grooved structures, the shell is bent inward to form a bent portion, and the bent portion is used to limit the position of the electrode assembly in the shell. Due to the structural characteristics of this type of battery cell, for example, during the groove rolling process and bending to form the bent portion, the bent portion and the end cap may be short-circuited due to factors such as assembly or material abnormalities, thereby causing the battery cell to be unable to be used normally.

[0070] Based on the above considerations, in order to solve the problem that the battery cell in the related technology is prone to insulation failure between the end cover and the area near the bending portion, a battery cell is designed, by arranging a first insulating layer body on the inner wall surface of the connecting groove formed by the bending portion and the flange portion, and utilizing the first insulating layer body to insulate and protect the bending portion and the flange portion, so as to separate the end cover from the bending portion and the flange portion, thereby effectively reducing the probability of short circuit between the end cover and the area near the bending portion, and further effectively improving the insulation failure between the end cover and the area near the bending portion.

[0071] The battery cell disclosed in the embodiment of the present application can be used in electrical equipment that uses the battery as a power source or various energy storage systems that use the battery as an energy storage element. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0073] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0074] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0076] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0077] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. In the present application, the battery cell 20 is described by taking a cylindrical battery cell 20 as an example.

[0078] See also Figure 3 , is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 includes a housing 21, an end cover 22, and an electrode assembly 23. The housing 21 has a receiving cavity 211 with an opening 212 at one end, and the receiving cavity 211 is used to receive the electrode assembly 23. The end cover 22 is connected to the housing 21 and closes the opening 212.

[0079] The end cap 22 refers to a component that covers the opening 212 of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 22 can be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 22 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. The material of the end cap 22 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. Optionally, an electrode terminal 221 is also provided on the end cap 22, and the electrode terminal 221 is used to be electrically connected to the pole ear 231 of the electrode assembly 23 to input or output the electrical energy of the battery cell 20. The electrode terminal 221 and the pole ear 231 can be directly connected, for example, the electrode terminal 221 and the pole ear 231 are directly welded. The electrode terminal 221 and the electrode tab 231 may also be indirectly connected. For example, the electrode terminal 221 and the electrode tab 231 are indirectly connected via a current collecting member.

[0080] The shell 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 21 and the end cap 22 can be independent components, and an opening 212 can be set on the shell 21, and the end cap 22 is made to cover the opening 212 at the opening 212 to form the internal environment of the battery cell 20. Without limitation, the end cap 22 and the shell 21 can also be integrated. Specifically, the end cap 22 and the shell 21 can form a common joint surface before other components are put into the shell, and when the interior of the shell 21 needs to be encapsulated, the end cap 22 is made to cover the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0081] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 21. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear 231. The positive pole ear 231 and the negative pole ear 231 may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte.

[0082] According to some embodiments of the present application, referring to Figures 3 to 5 The embodiment of the present application provides a battery cell 20, including an electrode assembly 23, a shell 21, an end cover 22, an insulating member 28 and a first insulating layer body 24. A housing cavity 211 with an opening 212 is formed on the shell 21. The peripheral side wall of the shell 21 is bent toward the housing cavity 211 to form a bending portion 213. The electrode assembly 23 is limitedly arranged in the housing cavity 211 by the bending portion 213; the shell 21 is provided with a flange portion 214 at the opening 212, and the bending portion 213 and the flange portion 214 are jointly enclosed to form a connecting groove 215; the end cover 22 is covered on the opening 212, and a part of the end cover 22 is inserted into the connecting groove 215; at least a part of the insulating member 28 is arranged in the connecting groove 215, and is located between the end cover 22 and the inner wall of the connecting groove 215, and the first insulating layer body 24 is arranged on the inner wall surface of the connecting groove 215.

[0083] The bending portion 213 refers to a bending structure formed by bending the housing 21 toward the accommodating cavity 211, and can be formed by, for example, processing the housing 21 with a groove rolling process; it can be understood that the bending portion 213 forms a ring shape around the circumferential direction of the housing 21. The bending portion 213 can be bent toward the accommodating cavity 211 to form a bending structure with an axial section of an arc structure, a hemispherical structure, a spherical structure, a U-shaped structure, etc.

[0084] When the electrode assembly 23 is accommodated in the accommodating cavity 211 , the bent portion 213 can limit the electrode assembly 23 to reduce the probability of the electrode assembly 23 shaking in the accommodating cavity 211 .

[0085] The flange portion 214 is disposed at the opening 212 of the housing 21. Optionally, the flange portion 214 can be fixedly connected to the housing 21 by welding or the like, or the flange portion 214 can be integrally bent and formed with the housing 21. It can be understood that the flange portion 214 forms a ring around the circumferential direction of the housing 21, and the hollow area formed by the flange portion 214 is the opening 212 of the housing 21.

[0086] The bending portion 213 and the flange portion 214 together enclose a connection groove 215; thus, part of the end cover 22 can be inserted into the connection groove 215 and form a plug-in connection, so that the end cover 22 can cover and block the opening 212 to achieve the purpose of isolating the accommodating cavity 211 from the external environment.

[0087] The insulating member 28 is used to fill between the end cover 22 and the inner wall of the connecting groove 215 to improve the sealing and protection effect of the accommodating cavity 211; at the same time, the insulating member 28 can also separate the end cover 22 from the inner wall of the connecting groove 215 to improve the insulation protection between the end cover 22 and the inner wall of the connecting groove 215. Optionally, the insulating member 28 can be, but is not limited to, a structural member with good insulation performance and a certain elasticity such as insulating rubber, insulating plastic, insulating silicone, etc., such as an insulating block, an insulating pad, an insulating rubber layer, etc. The insulating member 28 can be fixed between the end cover 22 and the inner wall of the connecting groove 215 by bonding, clamping, etc.

[0088] Among them, a first insulating layer 24 is arranged on the inner wall surface of the connecting groove 215; optionally, the first insulating body includes but is not limited to an insulating layer structure with insulating properties such as an insulating film, an insulating coating, and an insulating adhesive tape. It can be understood that the first insulating layer 24 is arranged on the inner wall surface of the connecting groove 215, that is, the part of the bending portion 213 located in the connecting groove 215, the part of the flange portion 214 located in the connecting groove 215, and the part of the shell 21 located in the connecting groove 215 are all covered with the first insulating layer; thus, even if factors such as assembly or incoming material abnormality occur during the process of processing and forming the bending portion 213, the end cover 22 and the inner wall surface of the connecting groove 215 will be separated by the first insulating layer 24, and the probability of direct contact between the end cover 22 and the inner wall surface of the connecting groove 215 is low, so that the probability of short circuit between the end cover 22 and the shell 21, or between the end cover 22 and the bending portion 213 or the flange portion 214 on the shell 21 is also low.

[0089] In the battery cell 20 provided in the embodiment of the present application, the end cover 22 is inserted into the connecting groove 215 to be assembled at the opening 212 of the shell 21, and the insulating member 28 is used to seal and insulate the end cover 22 and the inner wall of the connecting groove 215; at the same time, a first insulating layer 24 is arranged on the inner wall surface of the connecting groove 215 formed by the bending portion 213 and the flange portion 214, so that the inner wall of the connecting groove 215 can be further insulated to reduce the probability of short circuit between the end cover 22 and the inner wall surface of the connecting groove 215, thereby reducing the probability of insulation failure between the end cover 22 and the bending portion 213 and the flange portion 214 of the shell 21.

[0090] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, a portion of the flange portion 214 outside the connection groove 215 is provided with a second insulating layer body 25 , and the second insulating layer body 25 is connected to the first insulating layer body 24 .

[0091] It can be understood that the second insulating layer 25 includes but is not limited to an insulating layer structure with insulating properties such as an insulating film, an insulating coating, and an insulating tape; optionally, the material, thickness and other parameters of the second insulating layer 25 can be consistent with the first insulating layer 24, or the material, thickness and other parameters of the second insulating layer 25 can also be partially consistent with or different from those of the first insulating layer 24.

[0092] The second insulating layer body 25 is connected to the first insulating layer body 24. Optionally, the second insulating layer body 25 and the first insulating layer body 24 can be integrally formed, or the second insulating layer body 25 and the first insulating layer body 24 can be connected to form a whole by hot-melt connection, bonding, etc.

[0093] The second insulating layer body 25 and the first insulating layer body 24 may be connected or overlapped, so that the outer surface of the flange portion 214 is completely covered by the second insulating layer body 25 and the first insulating layer body 24 .

[0094] In this way, by arranging a second insulating layer body 25 at the part of the flange portion 214 located outside the connecting groove 215 to provide insulation protection for the flange portion 214, the probability of overlapping short circuit between the flange portion 214 and the external structure can be effectively reduced; at the same time, the first insulating layer body 24 and the second insulating layer body 25 are connected to completely cover the flange portion 214, so that the insulation protection effect between the end cover 22 and the flange portion 214 is better.

[0095] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, the second insulating layer 25 extends to cover at least a portion of the outer peripheral wall of the shell 21 .

[0096] The outer peripheral wall surface of the housing 21 refers to a side surface of the peripheral side wall surface formed by the housing 21 in the height direction H and located outside the accommodating cavity 211 .

[0097] In this way, the second insulating layer 25 is arranged on the part of the flange portion 214 outside the connecting groove 215, and the second insulating layer 25 is extended to cover at least part of the outer peripheral wall surface of the shell 21, so that the second insulating layer 25 can provide more sufficient insulation protection for the outer surface of the shell 21, and can further reduce the probability of overlapping short circuit between the shell 21 and the external structure.

[0098] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, an insulating protective film 216 is wrapped around the outer peripheral wall of the shell 21, and on any plane parallel to the height direction H of the shell 21, the orthographic projection of the insulating protective film 216 intersects with the orthographic projection of the second insulating layer 25.

[0099] The insulating protective film 216 refers to a film layer structure with better insulating performance. The insulating protective film 216 is used to wrap around the outer peripheral wall surface of the shell 21 and provide insulation protection for the outer peripheral wall surface of the shell 21.

[0100] The orthographic projection of the insulating protection film 216 on any plane parallel to the height direction H of the housing 21 refers to the projection of the insulating protection film 216 along the height direction H perpendicular to the housing 21 .

[0101] Similarly, the orthographic projection of the second insulating layer 25 on any plane parallel to the height direction H of the shell 21 refers to the projection of the second insulating layer 25 along the height direction H perpendicular to the shell 21 .

[0102] On any plane parallel to the height direction H of the housing 21, the orthographic projection of the insulating protective film 216 intersects with the orthographic projection of the second insulating layer body 25, that is, the insulating protective film 216 can be connected to the second insulating layer body 25 at any end parallel to the height direction H of the housing 21, and together they are used to cover the outer peripheral wall surface of the housing 21, so as to fully insulate and protect the outer peripheral wall surface of the housing 21. Optionally, the insulating protective film 216 and the second insulating layer body 25 can be fixed by bonding, hot-melt connection, etc.

[0103] Exemplarily, the insulating protective film 216 and the second insulating layer body 25 can act together on the outer peripheral wall surface of the shell 21 and completely cover the outer peripheral wall surface of the shell 21 .

[0104] In this way, the second insulating layer 25 and the insulating protective film 216 wrapped around the outer wall of the shell 21 are connected so that the second insulating layer 25 and the insulating protective film 216 are used to jointly prevent the outside of the shell 21 from slipping, thereby further reducing the probability of overlapping short circuits between the shell 21 and the external structure.

[0105] Please refer to Figure 3 , Figure 4 and Figure 6 In some embodiments, the thickness of the first insulating layer 24 is J, the thickness of the shell 21 is D, wherein 0<J / D≤1; and / or, the thickness of the second insulating layer 25 is K, the thickness of the shell 21 is D, wherein 0<K / D≤1.

[0106] By setting the ratio of the thickness of the first insulating layer 24 to the thickness of the shell 21 to be greater than 0 and less than or equal to 1, that is, the thickness of the first insulating layer 24 is not greater than the thickness of the shell 21, the thickness range of the first insulating layer 24 is limited to reduce the impact of the thickness of the first insulating layer 24 on the space of the accommodating cavity 211 inside the shell 21; and / or, by setting the ratio of the thickness of the second insulating layer 25 to the thickness of the shell 21 to be greater than 0 and less than or equal to 1, that is, the thickness of the second insulating layer 25 is not greater than the thickness of the shell 21, the thickness range of the first insulating layer 24 is limited to reduce the impact of the second insulating layer 25 on the overall volume of the battery cell 20.

[0107] For example, in some specific embodiments, the thickness of the first insulating layer body 24 is consistent with the thickness of the second insulating layer body 25 , and the first insulating layer body 24 can be integrally formed with the second insulating layer body 25 .

[0108] Please refer to Figure 3 , Figure 4 and Figure 6 , in some embodiments, 0.1≤J / D≤0.5; and / or, 0.1≤K / D≤0.5.

[0109] By further limiting the ratio of the thickness of the first insulating layer 24 to the thickness of the shell 21 to be greater than or equal to 0.1 and less than or equal to 0.5, the thickness of the first insulating layer 24 can further reduce the spatial influence of the accommodating cavity 211 inside the shell 21 while ensuring the insulation of the first insulating layer 24; and / or, by further limiting the ratio of the thickness of the second insulating layer 25 to the thickness of the shell 21 to be greater than or equal to 0.1 and less than or equal to 0.5, the thickness of the second insulating layer 25 can further reduce the spatial influence of the accommodating cavity 211 inside the shell 21 while ensuring the insulation of the second insulating layer 25.

[0110] Please refer to Figures 3 to 6 In some embodiments, the insulating member 28 includes an insulating portion 281 and a sealing portion 282 , wherein at least a portion of the insulating portion 281 is located between the end cap 22 and the flange portion 214 , and at least a portion of the sealing portion 282 is located between the end cap 22 and the bending portion 213 .

[0111] The insulating portion 281 is used to separate the end cover 22 and the flange portion 214 to improve the insulation protection between the end cover 22 and the flange portion 214 .

[0112] Optionally, the insulating part 281 can be but is not limited to insulating rubber, insulating plastic, insulating silicone or other structural parts with better insulating properties, such as insulating blocks, insulating pads, insulating rubber layers and other structural parts; the insulating part can be fixed between the end cover 22 and the flange part 214 by bonding, clamping or the like.

[0113] Exemplarily, the insulating portion 281 may be made of a plastic structure, and the plastic structure may be bonded and fixed to the wall surface of the flange portion 214 .

[0114] The sealing portion 282 is used to improve the sealing effect between the end cover 22 and the bending portion 213, thereby improving the sealing and protection effect of the electrode assembly 23 accommodated in the accommodating cavity 211 and limited by the bending portion 213, and reducing the probability of leakage of the electrolyte in the accommodating cavity 211.

[0115] The sealing part 282 includes but is not limited to sealing structures such as a sealing block, a sealing gasket, and a sealing ring; the material of the sealing part 282 can be a rubber sealing part 282, a silicone sealing part 282, etc.

[0116] Optionally, the sealing portion 282 can be fixed between the end cover 22 and the bending portion 213 by bonding, clamping, etc., and is used to fill the gap between the end cover 22 and the bending portion 213, thereby achieving the purpose of improving the sealing effect between the end cover 22 and the bending portion 213.

[0117] Exemplarily, a sealing portion 282 is provided between the end cover 22 and the bending portion 213, and an insulating portion 281 is provided between the end cover 22 and the flange portion 214, so that the sealing portion 282, the end cover 22 and the insulating portion 281 can be clamped in the connecting groove 215, and the insulating portion 281 can be elastically deformed due to the clamping according to its own elasticity, so that the insulating portion 281 fills the gap in the connecting groove 215 to form a better sealing and insulating effect.

[0118] In this configuration, the insulating portion 281 is used to provide insulation protection between the end cover 22 and the flange portion 214 , and the sealing portion 282 is used to provide sealing protection between the end cover 22 and the bent portion 213 .

[0119] Please refer to Figures 3 to 6 In some embodiments, a portion of the insulating portion 281 extends into the opening 212 and is used to separate the end cap 22 and the flange portion 214 .

[0120] A portion of the insulating portion 281 is inserted into the connecting groove 215 and is located between the end cover 22 and the flange portion 214 , and another portion of the insulating portion 281 can extend out of the connecting groove 215 and extend to the opening 212 , so that the insulating portion 281 can also divide the end cover 22 and the flange portion 214 at the opening 212 .

[0121] In this way, by extending part of the insulating portion 281 into the opening 212, the extended part of the insulating portion 281 can separate the flange portion 214 from the end cover 22 located at the opening 212, and can more fully provide insulation protection for the flange portion 214, thereby further reducing the probability of short circuit between the end cover 22 and the flange portion 214.

[0122] Please refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, the portion of the bending portion 213 located in the accommodating cavity 211 is provided with a third insulating layer 26 , and the third insulating layer 26 is used to separate the bending portion 213 and the electrode assembly 23 , and the third insulating layer 26 is connected to the first insulating layer 24 .

[0123] It can be understood that the portion of the bent portion 213 located in the accommodating cavity 211 refers to the surface portion of the bent portion 213 facing the electrode assembly 23 .

[0124] The third insulating layer 26 includes but is not limited to an insulating layer structure with insulating properties such as an insulating film, an insulating coating, and an insulating tape; optionally, the material, thickness and other parameters of the third insulating layer 26 may be consistent with those of the first insulating layer 24, or the material, thickness and other parameters of the third insulating layer 26 may also be partially consistent with or different from those of the first insulating layer 24.

[0125] The third insulating layer body 26 is connected to the first insulating layer body 24. Optionally, the third insulating layer body 26 and the first insulating layer body 24 can be integrally formed, or the third insulating layer body 26 and the first insulating layer body 24 can be connected to form a whole by hot-melt connection, bonding, etc.

[0126] The third insulating layer body 26 and the first insulating layer body 24 may be connected or overlapped, so that the outer surface of the bent portion 213 is completely covered by the third insulating layer body 26 and the first insulating layer body 24 .

[0127] Optionally, the third insulating layer 26 may also extend to the inner peripheral wall surface of the shell 21 to achieve a more sufficient insulation protection effect.

[0128] In this way, by arranging the third insulating layer 26 at the part of the bending portion 213 located in the accommodating cavity 211, and utilizing the third insulating layer 26 to separate the bending portion 213 and the electrode assembly 23, during the use of the battery cell 20, even if the electrode assembly 23 expands, or the battery cell 20 is in a vibrating condition, the probability of overlapping short circuit between the bending portion 213 and the electrode assembly 23 is effectively reduced; and, the first insulating layer 24 and the third insulating layer 26 are connected, and the first insulating layer 24 and the third insulating layer 26 can completely cover the part of the bending portion 213 located in the accommodating cavity 211, which can further enhance the insulation protection effect of the bending portion 213.

[0129] Please refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, the battery cell 20 also includes a fourth insulating layer 27, which is disposed on the outer surface of the electrode assembly 23 facing the bending portion 213; in the height direction H of the shell 21, the orthographic projection of the fourth insulating layer 27 intersects with the orthographic projection of the third insulating layer 26.

[0130] The fourth insulating layer 27 includes but is not limited to an insulating layer structure such as an insulating film, an insulating coating, and an insulating adhesive tape; the fourth insulating layer 27 may cover at least a portion of the outer surface of the electrode assembly 23 facing the bending portion 213. Exemplarily, the fourth insulating layer 27 may be made of a tab glue, which is attached to the outer surface of the electrode assembly 23 facing the bending portion 213, and at the same time, the tab glue also extends to cover at least a portion of the peripheral side surface of the electrode assembly 23.

[0131] Among them, the orthographic projection of the fourth insulating layer 27 and the orthographic projection of the third insulating layer 26 intersect in the height direction H of the shell 21, that is, the fourth insulating layer 27 and the third insulating layer 26 intersect or overlap between the bending portion 213 and the electrode assembly 23, so that the fourth insulating layer 27 and the third insulating layer 26 can be used together for insulation protection between the bending portion 213 and the electrode assembly 23.

[0132] In this way, the fourth insulating layer 27 is used to be arranged on the outer surface of the electrode assembly 23 on the side facing the bending portion 213 to achieve insulation protection for the electrode assembly 23. At the same time, the fourth insulating layer 27 and the third insulating layer 26 have their orthographic projections in the height direction H of the shell 21 intersect, so that the fourth insulating layer 27 and the third insulating layer 26 can be used together for insulation protection between the bending portion 213 and the electrode assembly 23, so as to further reduce the probability of overlapping short circuit between the electrode assembly 23 and the bending portion 213.

[0133] Please refer to Figure 3 , Figure 4and Figure 7 In some embodiments, in the height direction H of the shell 21 , the fourth insulating layer 27 and the third insulating layer 26 have an overlapping width M, and the width of the bending portion 213 is N, wherein 0≤M / N<1.

[0134] The overlapping width M of the fourth insulating layer 27 and the third insulating layer 26 in the height direction H of the housing 21 refers to the width of the portion where the orthographic projection of the fourth insulating layer 27 and the orthographic projection of the third insulating layer 26 overlap in the height direction H of the housing 21, as shown in FIG. Figure 5 shown.

[0135] The width N of the bending portion 213 refers to the width of the orthographic projection of the bending portion 213 in the height direction H of the housing 21 , that is, the distance of the bending portion 213 in the radial direction of the housing 21 .

[0136] In this way, by limiting the ratio of the overlapping width M of the fourth insulating layer body 27 and the third insulating layer body 26 in the height direction H of the shell 21 and the width N of the bending portion 213 to be greater than or equal to 0 and less than 1, that is, the fourth insulating layer body 27 and the third insulating layer body 26 can only intersect without overlapping, or the fourth insulating layer body 27 and the third insulating layer body 26 can overlap, and that is, the overlapping range of the fourth insulating layer body 27 and the third insulating layer body 26 is within the width range of the bending portion 213, so as to provide sufficient insulation protection between the bending portion 213 and the electrode assembly 23.

[0137] Please refer to Figure 3 , Figure 4 and Figure 7 , in some embodiments, 0≤M / N≤0.5.

[0138] In this way, by limiting the ratio of the overlapping width M of the fourth insulating layer 27 and the third insulating layer 26 in the height direction H of the shell 21 and the width N of the bending portion 213 to be greater than or equal to 0 and less than or equal to 0.5, that is, further limiting the overlapping range of the fourth insulating layer 27 and the third insulating layer 26 to half or less of the width range of the bending portion 213, the amount of the fourth insulating layer 27 and / or the third insulating layer 26 is reduced on the basis of providing sufficient insulation protection between the bending portion 213 and the electrode assembly 23.

[0139] Please refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, a gap is formed between the third insulating layer 26 and the inner peripheral wall of the shell 21 .

[0140] It can be understood that a gap is formed between the third insulating layer 26 and the inner circumferential wall of the shell 21 , that is, the third insulating layer 26 covers the portion of the bending portion 213 outside the connecting groove 215 , and the third insulating layer 26 does not extend to cover the inner circumferential wall of the shell 21 .

[0141] The inner peripheral wall surface of the shell 21 mentioned above refers to a side surface of the peripheral side wall surface formed by the shell 21 in the height direction H and located in the accommodating cavity 211 .

[0142] In this way, the third insulating layer 26 is arranged to form a gap with the inner circumferential wall of the shell 21 so that the third insulating layer 26 will not extend to the inner circumferential wall of the shell 21, thereby reducing the influence of the third insulating layer 26 on the space utilization of the electrode assembly 23 in the radial direction due to its own thickness.

[0143] Please refer to Figure 3 , Figure 4 and Figure 7 In some embodiments, the thickness of the third insulating layer 26 is L, and the thickness of the shell 21 is D, wherein 0<L / D≤1.

[0144] In this way, by setting the ratio of the thickness of the third insulating layer 26 to the thickness of the shell 21 to be greater than 0 and less than or equal to 1, that is, the thickness of the third insulating layer 26 is not greater than the thickness of the shell 21, the thickness range of the third insulating layer 26 is limited to reduce the influence of the thickness of the third insulating layer 26 on the space of the accommodating cavity 211 inside the shell 21.

[0145] For example, in some specific embodiments, the thickness of the first insulating layer body 24 is consistent with the thickness of the third insulating layer body 26 , and the first insulating layer body 24 can be integrally formed with the third insulating layer body 26 .

[0146] Please refer to Figure 3 , Figure 4 and Figure 7 , in some embodiments, 0.1≤L / D≤0.5.

[0147] In this way, by further limiting the ratio of the thickness of the third insulating layer 26 to the thickness of the shell 21 to greater than or equal to 0.1 and less than or equal to 0.5, the thickness range of the third insulating layer 26 is limited to reduce the impact of the thickness of the third insulating layer 26 on the space of the accommodating cavity 211 inside the shell 21.

[0148] Hereinafter, the battery cell 20 of the present application will be described in conjunction with specific embodiments.

[0149] Please refer to Figures 2 to 8In the embodiment of the present application, the battery cell 20 is described as a cylindrical structure. The battery cell 20 includes a shell 21 and an end cover 22. The shell 21 is formed with a receiving cavity 211 having an opening 212. The peripheral side wall of the shell 21 is bent toward the receiving cavity 211 to form a bending portion 213. The electrode assembly 23 is limitedly arranged in the receiving cavity 211 by the bending portion 213. The shell 21 is provided with a flange portion 214 at the opening 212. The flange portion 214 and the bending portion 213 are enclosed together to form a connecting groove 215. Part of the end cover 22 is inserted into the connecting groove 215 and covers the opening 212.

[0150] Among them, a first insulating layer body 24 is arranged on the inner wall surface of the connecting groove 215, a second insulating layer body 25 is arranged on the part of the flange portion 214 located outside the connecting groove 215, and a third insulating layer body 26 is arranged on the part of the bending portion 213 located outside the connecting groove 215, and the first insulating layer body 24 is respectively connected with the second insulating layer body 25 and the third insulating layer body 26 to form a whole; the first insulating layer body 24 can reduce the probability of short circuit between the end cover 22 and the bending portion 213 or the flange portion 214 in the connecting groove 215, the second insulating layer body 25 can reduce the probability of overlapping short circuit between the flange portion 214 and the external structure, and the third insulating layer body 26 can reduce the probability of overlapping short circuit between the electrode assembly 23 and the bending portion 213.

[0151] The surface of the electrode assembly 23 facing the bending portion 213 is also provided with a fourth insulating layer 27, and the fourth insulating layer 27 can be made of a tab glue, which can cover at least part of the outer surface of the electrode assembly 23 facing the bending portion, and the tab glue can also extend to cover the peripheral side wall of the electrode assembly 23. In the height direction H of the shell 21, the orthographic projection of the tab glue and the orthographic projection of the third insulating layer 26 overlap, so that the tab glue and the third insulating layer 26 can be used together to provide insulation protection between the bending portion 213 and the electrode assembly 23.

[0152] At the same time, an insulating part 28 is also arranged in the connecting groove 215. The insulating part 28 includes an insulating portion 281 and a sealing portion 282. The insulating portion 281 is arranged between the end cover 22 and the flange portion 214, and the sealing portion 282 is arranged between the end cover 22 and the bending portion 213, so that the sealing portion 282, the end cover 22 and the insulating portion 281 are jointly inserted into the connecting groove 215 and erected in the connecting groove 215. The sealing portion 282 can be squeezed to undergo elastic deformation and fill the gap between the end cover 22 and the bending portion 213 to achieve a sealing effect.

[0153] Please refer to Figure 2 , Figure 3 and Figure 8 In a second aspect, an embodiment of the present application further provides a battery 100, comprising the battery cell 20 as described above.

[0154] The battery 100 provided in the embodiment of the present application includes the above-mentioned battery cell 20. When the probability of insulation failure of the above-mentioned battery cell 20 is low, the probability of insulation failure of the battery 100 is also low.

[0155] Please refer to Figures 1 to 8 In a third aspect, an embodiment of the present application further provides an electrical device, including the battery 100 as described above, and the battery 100 is used to provide electrical energy.

[0156] The electrical equipment provided in the embodiment of the present application is, for example, the above-mentioned vehicle 1000; the electrical equipment includes the above-mentioned battery 100, and when the probability of insulation failure of the above-mentioned battery 100 is low, the probability of insulation failure of the electrical equipment is also low.

[0157] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include Electrode assembly; A shell, wherein a receiving cavity with an opening is formed on the shell, and a peripheral side wall of the shell is bent toward the receiving cavity to form a bent portion, and the electrode assembly is limitedly arranged in the receiving cavity by the bent portion; the shell is provided with a flange portion at the opening, and the bent portion and the flange portion are enclosed together to form a connecting groove; An end cover, the end cover is covered on the opening, and a portion of the end cover is inserted into the connecting groove; an insulating member, at least a portion of which is disposed in the connecting groove and between the end cover and an inner wall of the connecting groove; as well as A first insulating layer body is disposed on an inner wall surface of the connecting groove.

2. The battery cell according to claim 1, characterized in that: A second insulating layer body is disposed at a portion of the flange portion outside the connection groove, and the second insulating layer body is connected to the first insulating layer body.

3. The battery cell according to claim 2, characterized in that: The second insulating layer extends to cover at least a portion of the outer peripheral wall surface of the shell.

4. The battery cell according to claim 3, characterized in that: An insulating protective film is wrapped around the outer peripheral wall surface of the shell, and on any plane parallel to the height direction of the shell, the orthographic projection of the insulating protective film intersects with the orthographic projection of the second insulating layer body.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The thickness of the first insulating layer is J, and the thickness of the shell is D, wherein 0<J / D≤1; And / or, the thickness of the second insulating layer is K, the thickness of the shell is D, wherein 0<K / D≤1.

6. The battery cell according to claim 5, characterized in that: 0.1≤J / D≤0.5; and / or, 0.1≤K / D≤0.

5.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The insulating member comprises an insulating portion and a sealing portion, wherein at least a portion of the insulating portion is located between the end cover and the flange portion, and at least a portion of the sealing portion is located between the end cover and the bending portion.

8. The battery cell according to claim 7, characterized in that: Part of the insulating portion extends to the opening and is used to separate the end cover and the flange portion.

9. The battery cell according to any one of claims 1 to 8, characterized in that: A third insulating layer is provided at a portion of the bent portion located in the accommodating cavity. The third insulating layer is used to separate the bent portion and the electrode assembly. The third insulating layer is connected to the first insulating layer.

10. The battery cell according to claim 9, characterized in that: The battery cell further includes a fourth insulating layer body, which is disposed on the outer surface of the electrode assembly facing the bending portion; in the height direction of the shell, the orthographic projection of the fourth insulating layer body intersects with the orthographic projection of the third insulating layer body.

11. The battery cell according to claim 10, characterized in that: In the height direction of the shell, the fourth insulating layer body and the third insulating layer body have an overlapping width M, and the width of the bent portion is N, wherein 0≤M / N<1.

12. The battery cell according to claim 11, characterized in that: 0≤M / N≤0.

5.

13. The battery cell according to any one of claims 9 to 12, characterized in that: A gap is formed between the third insulating layer and the inner peripheral wall surface of the housing.

14. The battery cell according to any one of claims 9 to 13, characterized in that: The thickness of the third insulating layer is L, and the thickness of the shell is D, wherein 0<L / D≤1.

15. The battery cell according to claim 14, characterized in that: 0.1≤L / D≤0.

5.

16. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 15.

17. An electrical equipment, characterized in that: Comprising a battery as claimed in claim 16, the battery is used to provide electrical energy.

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